Commentary for Chullin 218:8

לב הוא דבעי קריעה אבל כחל לא בעי קריעה

Now it is only the heart that must be cut open [after the cooking], but the udder need not be cut open at all! - Perhaps the inference is: only for the heart does the cutting open [after the cooking] suffice, but for the udder the cuttin open [after the cooking] would not be sufficient.<span class="x" onmousemove="('comment',' And there is good reason for this distinction. As the heart is smooth and hard even in cooking the blood would not penetrate into it; the udder, on the other hand, is soft and spongy, and in cooking, the milk would Penetrate into it, and it would be impossible to remove it.');">³</span>

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